JPWO2016152213A1 - drill - Google Patents

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JPWO2016152213A1
JPWO2016152213A1 JP2017507535A JP2017507535A JPWO2016152213A1 JP WO2016152213 A1 JPWO2016152213 A1 JP WO2016152213A1 JP 2017507535 A JP2017507535 A JP 2017507535A JP 2017507535 A JP2017507535 A JP 2017507535A JP WO2016152213 A1 JPWO2016152213 A1 JP WO2016152213A1
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margin
pad
drill
width
continuous
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JP6383092B2 (en
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宏之 福島
宏之 福島
明浩 大澤
明浩 大澤
淳也 小野瀬
淳也 小野瀬
福田　敏彦
敏彦 福田
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Honda Motor Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/02—Twist drills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/04—Angles, e.g. cutting angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/04—Angles, e.g. cutting angles
    • B23B2251/043—Helix angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/18—Configuration of the drill point
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/40—Flutes, i.e. chip conveying grooves
    • B23B2251/408—Spiral grooves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/44—Margins, i.e. the narrow portion of the land which is not cut away to provide clearance on the circumferential surface
    • B23B2251/443—Double margin drills

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)

Abstract

刃部(20)は、２つのランド(30)と２つの溝(21)とを交互に有する共に直線状のチゼルエッジ(24)を有し、前記ランドは、切刃に連続するマージン部(32)と、このマージン部から連続し且つ前記マージン部より小径の逃げ部(33)と、この逃げ部から連続し且つ前記マージン部の幅と同一の幅のパッド(34)とを備えている。The blade portion (20) has a linear chisel edge (24) having two lands (30) and two grooves (21) alternately, and the lands have a margin portion (32 ), A relief portion (33) that is continuous from the margin portion and has a smaller diameter than the margin portion, and a pad (34) that is continuous from the relief portion and has the same width as the margin portion.

Description

本発明は、鋳抜き穴の加工に適するドリルに関する。   The present invention relates to a drill suitable for machining a punched hole.

鋳抜き穴は、鋳型に付属したピンにより、鋳物に形成される穴である。鋳抜き穴は、鋳放しであるため寸法精度が悪い。そこで、ドリルで、鋳抜き穴に機械加工を加えることが好まれる。そのためのドリルは、鋳抜き穴用ドリルと呼ばれ、各種の形態が提案されてきた（例えば、特許文献１参照）。   The cast hole is a hole formed in the casting by a pin attached to the mold. Since the cast hole is as-cast, the dimensional accuracy is poor. Therefore, it is preferred to apply machining to the core hole with a drill. The drill for that purpose is called a core hole drill, and various forms have been proposed (for example, refer to Patent Document 1).

特許文献１に示されるドリルは、一般にマージンと呼ばれるランド部と、このランド部より回転方向後方に配置されるパッド部とを備えている。更に、ランド部にパッド部が備えられている。このパッド部により、ドリルの直進性を高めることができる。   The drill shown in Patent Document 1 includes a land portion generally called a margin, and a pad portion disposed behind the land portion in the rotation direction. Furthermore, a pad portion is provided in the land portion. With this pad portion, the straightness of the drill can be improved.

しかし、パッド部を追加したにも拘わらず、ビビリが発生することが分かった。結果、穴の位置精度及び穴の内面精度が期待ほど高まらなかった。
そのため、パッド部を備えるドリルにおいて、穴の位置精度及び穴の面の加工精度をより高めることができるドリルが望まれる。However, it was found that chatter occurred despite the addition of the pad portion. As a result, the hole position accuracy and the hole inner surface accuracy were not as high as expected.
Therefore, in a drill having a pad portion, a drill that can further improve the hole position accuracy and the hole surface processing accuracy is desired.

特開２００９−０１８３８４号公報JP 2009-018384 A

本発明は、パッドを備えるドリルにおいて、穴の位置精度及び穴の面の加工精度をより高めることができるドリルを提供することを課題とする。   This invention makes it a subject to provide the drill which can raise the positional accuracy of a hole, and the processing precision of the surface of a hole more in a drill provided with a pad.

請求項１に係る発明は、先端に切刃が形成されている刃部と、この刃部の後端に連続して形成されているシャンク部とを備えるドリルであって、
前記刃部は、正面視で、２つのランドと２つの溝とを交互に有する共に直線状のチゼルエッジを有し、
前記ランドに、切刃に連続するマージン部と、このマージン部から連続し且つ前記マージン部より小径の逃げ部と、この逃げ部から連続し且つ前記マージン部の幅と同一の幅のパッドとを備え、
前記パッドは、シンニング面と直交する線の上に配置されている。The invention according to claim 1 is a drill comprising a blade portion having a cutting edge formed at the tip, and a shank portion formed continuously at the rear end of the blade portion,
The blade portion has both a linear chisel edge alternately having two lands and two grooves in a front view,
The land includes a margin portion that is continuous with the cutting edge, a relief portion that is continuous from the margin portion and has a smaller diameter than the margin portion, and a pad that is continuous from the relief portion and has the same width as the margin portion. Prepared,
The pad is disposed on a line orthogonal to the thinning surface.

請求項２に係る発明では、好ましくは、マージンの幅が、パッドの幅に比較して小さく設定されている。   In the invention according to claim 2, preferably, the width of the margin is set smaller than the width of the pad.

請求項３に係る発明では、好ましくは、側面視で、第２逃げ角は、６〜８°の範囲に設定されている。   In the invention according to claim 3, the second clearance angle is preferably set in a range of 6 to 8 ° in a side view.

請求項４に係る発明では、好ましくは、パッドは、マージンに対して、３０〜７５°後方の位置に配置されている。   In the invention which concerns on Claim 4, Preferably, the pad is arrange | positioned 30-75 degree back positions with respect to the margin.

請求項１に係る発明では、シンニング面と直交する線の上に、パッドを配置した。
シンニング面に加わる切削抵抗力は、シンニング面と直交する方向に加わる。放置するとビビリが発生する。本発明では、シンニング面に加わる切削抵抗力をパッドで受けさせるように、シンニング面と直交する線の上に、パッドを配置した。結果、ビビリが発生しなくなった。
よって、本発明によれば、穴の位置精度及び穴の面の加工精度を高めることができるドリルが提供される。In the invention according to claim 1, the pad is disposed on the line orthogonal to the thinning surface.
The cutting force applied to the thinning surface is applied in a direction perpendicular to the thinning surface. If left unattended, chatter will occur. In the present invention, the pad is arranged on a line orthogonal to the thinning surface so that the cutting force applied to the thinning surface is received by the pad. As a result, no chatter occurred.
Therefore, according to this invention, the drill which can raise the positional accuracy of a hole and the processing precision of the surface of a hole is provided.

請求項２に係る発明では、マージンの幅をパッドの幅に比較して小さく設定したので、マージン部の摩擦抵抗によるラジアル方向の切削抵抗を低減しつつ、工具の曲げ強度を確保することができる。   In the invention according to claim 2, since the margin width is set smaller than the pad width, the bending strength of the tool can be secured while reducing the radial cutting resistance due to the frictional resistance of the margin portion. .

請求項３に係る発明では、側面視で、第２逃げ角を６〜８°の範囲に設定した。
切削加工直後に、パッドが威力を発揮するため、穴の位置精度及び穴の面の加工精度をより高めることができる。In the invention which concerns on Claim 3, the 2nd relief angle was set to the range of 6-8 degrees by the side view.
Immediately after the cutting process, the pad exhibits its power, so that the hole position accuracy and the hole surface processing accuracy can be further increased.

請求項４に係る発明では、パッドを、マージンに対して３０〜７５°後方の位置に配置した。ランドの位置が適正化され、穴の位置精度及び穴の面の加工精度をより一層高めることができる。   In the invention which concerns on Claim 4, the pad was arrange | positioned in the position of 30-75 degree back with respect to the margin. The position of the land is optimized, and the hole position accuracy and the hole surface processing accuracy can be further increased.

本発明に係るドリルの側面図である。It is a side view of the drill which concerns on this invention. 図１の２矢視図であり、（ａ）はドリルの正面図、（ｂ）は（ａ）のｂ部拡大図である。2A is a front view of the drill, and FIG. 2B is an enlarged view of a portion b of FIG. マージン及びパッドの幅を説明する図である。It is a figure explaining the width of a margin and a pad. パッドの位置を説明する図である。It is a figure explaining the position of a pad. 第２逃げ角を説明する図である。It is a figure explaining a 2nd clearance angle.

本発明の実施の形態を添付図に基づいて以下に説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１に示されるように、ドリル１０は、刃部２０と、この刃部２０から延びるシャンク部４０とからなる。ドリル１０は、十分に長い鋳抜き穴用ドリルである。   As shown in FIG. 1, the drill 10 includes a blade portion 20 and a shank portion 40 extending from the blade portion 20. The drill 10 is a sufficiently long cast hole drill.

図２（ａ）に示されるように、正面視で、刃部２０は、２つのランド３０、３０と、２つの溝２１、２１とを交互に有する。さらに刃部２０は、２つの油穴２３、２３及び直線状のチゼルエッジ２４を有している。
図２（ａ）のｂ部拡大図である図２（ｂ）に示されるように、幅がＷｍｂであるマージン部３２に、幅がＷｍであるマージン３５が含まれる。As shown in FIG. 2A, the blade portion 20 has two lands 30 and 30 and two grooves 21 and 21 alternately in front view. Further, the blade portion 20 has two oil holes 23 and 23 and a linear chisel edge 24.
As shown in FIG. 2B, which is an enlarged view of the portion b in FIG. 2A, the margin portion 32 having a width of Wmb includes a margin 35 having a width of Wm.

詳しくは、ランド３０には、切刃３１に連続するマージン部３２と、このマージン部３２から連続し且つマージン部３２より小径の逃げ部３３と、この逃げ部３３から連続し且つマージン部３２の幅Ｗｍｂと同一の幅（図３、Ｗｐ）のパッド３４とを備えている。好ましくは、パッド３４の後端を溝２１に繋げる。   Specifically, the land 30 includes a margin portion 32 that is continuous with the cutting edge 31, a relief portion 33 that is continuous from the margin portion 32 and has a smaller diameter than the margin portion 32, a continuous portion of the margin portion 32 that is continuous from the relief portion 33. A pad 34 having the same width (FIG. 3, Wp) as the width Wmb is provided. Preferably, the rear end of the pad 34 is connected to the groove 21.

図３に示されるように、チゼルエッジ２４は、２つのシンニング２５、２５により、狭い幅に形成される。シンニング角θ１は９０°とした。   As shown in FIG. 3, the chisel edge 24 is formed with a narrow width by two thinnings 25, 25. The thinning angle θ1 was 90 °.

マージン３５の幅Ｗｍは、大きいほど直進性が高まるが、反面、切削抵抗が増加する。マージン３５の幅Ｗｍは、０．１〜０．１５ｍｍとすることで、直進性を維持しつつ、切削抵抗を抑えるようにした。   As the width Wm of the margin 35 is increased, the straightness is improved, but the cutting resistance is increased. By setting the width Wm of the margin 35 to 0.1 to 0.15 mm, the cutting resistance is suppressed while maintaining straightness.

パッド３４とマージン３５は同一の円周の上に形成されている。   The pad 34 and the margin 35 are formed on the same circumference.

マージン３５の幅（図２（ｂ）、符号Ｗｍ）は、小さいほど切削抵抗が抑えられるが、反面、ドリルの強度が低下する。マージン部３２の幅Ｗｍｂは、ドリル１０の径の０．０８倍とすることで、直進性を維持しつつ、ドリルの強度低下を抑えるようにした。   The smaller the width of the margin 35 (FIG. 2 (b), symbol Wm), the lower the cutting resistance, but the lower the strength of the drill. The width Wmb of the margin portion 32 is set to 0.08 times the diameter of the drill 10 so as to suppress a decrease in the strength of the drill while maintaining straightness.

したがって、マージン部３２の幅Ｗｍｂとパッド３４の幅Ｗｐとを同一に設定することで、直進性を維持しつつ、切削抵抗を抑えることができる。   Therefore, by setting the width Wmb of the margin portion 32 and the width Wp of the pad 34 to be the same, it is possible to suppress the cutting resistance while maintaining the straight traveling performance.

図４（ａ）に示されるように、切刃の一部であって、逃げ面とシンニング２５とのなす稜線をシンニング面２６とする。正面視でシンニング面２６に直交する線２７を描くと、この直交する線２７の上にパッド３４が配置される。
図４（ｂ）に示されるように、切削時にシンニング面２６に矢印（１）の力が加わるが、パッド３４が鋳抜き穴の内周面に当たることで、白抜き矢印（２）の力を発生する。２つの力が相殺され、ビビリの発生を抑制することができる。As shown in FIG. 4A, a ridgeline that is a part of the cutting edge and is formed by the flank and the thinning 25 is defined as a thinning surface 26. When a line 27 orthogonal to the thinning surface 26 is drawn in a front view, the pad 34 is disposed on the orthogonal line 27.
As shown in FIG. 4B, the force indicated by the arrow (1) is applied to the thinning surface 26 during cutting. Occur. The two forces are offset, and chattering can be suppressed.

図４（ａ）にて、パッド３４は、マージン部３２に対して、３０〜７５°の角度θ２をなす位置に配置されている。角度θ２は５０〜７０°が好ましく、６５°が最適である。
角度θ２を適正にすることにより、直進性が良好になると共に切削バランスが向上する。In FIG. 4A, the pad 34 is disposed at a position that forms an angle θ <b> 2 of 30 to 75 ° with respect to the margin portion 32. The angle θ2 is preferably 50 to 70 °, and most preferably 65 °.
By making the angle θ2 appropriate, the straightness is improved and the cutting balance is improved.

また、図５に示されるように、側面視で、二番逃げ角とも言われる第２逃げ角θ３を６〜８°に設定する。この範囲の角度であれば、チゼルエッジ２４とパッド３４先端との距離Ｌは小さくなる。距離Ｌが小さいと、切削加工直後に、パッドが威力を発揮する。パッドの威力で、穴の位置精度及び穴の面の加工精度をより高めることができる。
なお、第２逃げ角θ３が６°より小さいと切削抵抗が高くなり、ビビリが発生しやすい。また、第２逃げ角θ３が８°よりも大きいと切削加工開始後のパッドの効きが遅くなり、加工開始直後のビビリが抑制できず、精度が上がらない。そこで、第２逃げ角θ３は６〜８°に設定する。Further, as shown in FIG. 5, the second clearance angle θ3, which is also called the second clearance angle, is set to 6 to 8 ° in a side view. If the angle is within this range, the distance L between the chisel edge 24 and the tip of the pad 34 becomes small. When the distance L is small, the pad exhibits its power immediately after cutting. With the power of the pad, the positional accuracy of the hole and the processing accuracy of the surface of the hole can be further increased.
If the second clearance angle θ3 is smaller than 6 °, the cutting resistance increases and chatter is likely to occur. On the other hand, if the second clearance angle θ3 is larger than 8 °, the effectiveness of the pad after the start of machining is delayed, chattering immediately after the start of machining cannot be suppressed, and the accuracy does not increase. Therefore, the second clearance angle θ3 is set to 6 to 8 °.

尚、本発明のドリルは、鋳抜き穴の加工の他、一般部品への穴加工に供することは差し支えない。   The drill of the present invention can be used not only for punching holes but also for drilling general parts.

本発明のドリルは、鋳抜き穴の加工に好適である。   The drill according to the present invention is suitable for machining a punched hole.

１０…ドリル、２０…刃部、２１…溝、２４…チゼルエッジ、２６…シンニング面、２７…シンニング面に直交する線、３０…ランド、３１…切刃、３２…マージン部、３３…逃げ部、３４…パッド、３５…マージン、４０…シャンク部、θ２…マージンに対するパッドの角度、θ３…第２逃げ角、Ｗｍ…マージンの幅、Ｗｍｂ…マージン部の幅、Ｗｐ…パッドの幅。   DESCRIPTION OF SYMBOLS 10 ... Drill, 20 ... Blade part, 21 ... Groove, 24 ... Chisel edge, 26 ... Thinning surface, 27 ... Line orthogonal to thinning surface, 30 ... Land, 31 ... Cutting blade, 32 ... Margin part, 33 ... Escape part, 34... Pad, 35. Margin, 40. Shank, .theta.2... Pad angle relative to margin, .theta.3. Second clearance angle, Wm. Margin width, Wmb. Margin width, Wp.

Claims (4)

先端に切刃が形成されている刃部と、この刃部の後端に連続して形成されているシャンク部とを備えるドリルであって、
前記刃部は、正面視で、２つのランドと２つの溝とを交互に有する共に直線状のチゼルエッジを有し、
前記ランドに、切刃に連続するマージン部と、このマージン部から連続し且つ前記マージン部より小径の逃げ部と、この逃げ部から連続し且つ前記マージン部の幅と同一の幅のパッドとを備え、
前記パッドは、シンニング面と直交する線の上に配置されているドリル。A drill comprising a blade portion having a cutting edge formed at the tip and a shank portion formed continuously at the rear end of the blade portion,
The blade part has a straight chisel edge that has two lands and two grooves alternately in front view,
The land includes a margin portion that is continuous with the cutting edge, a relief portion that is continuous from the margin portion and has a smaller diameter than the margin portion, and a pad that is continuous from the relief portion and has the same width as the margin portion. Prepared,
The said pad is a drill arrange | positioned on the line orthogonal to a thinning surface. 前記マージンの幅が、パッドの幅に比較して小さく設定されている請求項１記載のドリル。   The drill according to claim 1, wherein a width of the margin is set smaller than a width of the pad. 側面視で、第２逃げ角は、６〜８°の範囲に設定されている請求項１記載のドリル。   The drill according to claim 1, wherein the second clearance angle is set in a range of 6 to 8 ° in a side view. 前記パッドは、前記マージンに対して、３０〜７５°後方の位置に配置されている請求項１記載のドリル。   The drill according to claim 1, wherein the pad is disposed at a position 30 to 75 ° rearward with respect to the margin.
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MX2017012088A (en) 2018-08-09
WO2016152213A1 (en) 2016-09-29

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